Probing the superconducting ground state of the rare-earth ternary boride superconductors RRuB2 (R= Lu,Y) using muon-spin rotation and relaxation
J. A. T. Barker, R. P. Singh, A. D. Hillier, D. McK. Paul
DOI 10.1103/PhysRevB.97.094506 · Physical Review B
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Abstract
The superconductivity in the rare-earth transition-metal ternary borides RRuB2 (where R=Lu and Y) has been investigated using muon-spin rotation and relaxation. Measurements made in zero field suggest that time-reversal symmetry is preserved upon entering the superconducting state in both materials; a small difference in depolarization is observed above and below the superconducting transition in both compounds, however, this has been attributed to quasistatic magnetic fluctuations. Transverse-field measurements of the flux-line lattice indicate that the superconductivity in both materials is fully gapped, with a conventional s-wave pairing symmetry and BCS-like magnitudes for the zero-temperature gap energies. The electronic properties of the charge carriers in the superconducting state have been calculated, with effective masses m*/me=9.8±0.1 and 15.0±0.1 in the Lu and Y compounds, respectively, with superconducting carrier densities ns=(2.73±0.04)×1028m−3 and (2.17±0.02)×1028m−3. The materials have been classified according to the Uemura scheme for superconductivity, with values for Tc/TF of 1/(414±6) and 1/(304±3), implying that the superconductivity may not be entirely conventional in nature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LuRuB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.8 | Pressure not reported | onset |
| YRuB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure not reported | onset |
| LuRuB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.8 | Pressure not reported | unknown |
| YRuB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure not reported | unknown |
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